684855457 has 8 divisors (see below), whose sum is σ = 804585600. Its totient is φ = 574703760.

The previous prime is 684855449. The next prime is 684855461. The reversal of 684855457 is 754558486.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 684855457 - 2³ = 684855449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (684855757) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2394457 + ... + 2394742.

It is an arithmetic number, because the mean of its divisors is an integer number (100573200).

Almost surely, 2^684855457 is an apocalyptic number.

It is an amenable number.

684855457 is a deficient number, since it is larger than the sum of its proper divisors (119730143).

684855457 is a wasteful number, since it uses less digits than its factorization.

684855457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4789223.

The product of its digits is 5376000, while the sum is 52.

The square root of 684855457 is about 26169.7431588466. The cubic root of 684855457 is about 881.4539741986.

The spelling of 684855457 in words is "six hundred eighty-four million, eight hundred fifty-five thousand, four hundred fifty-seven".